Author/Authors :
Rafiee، Saeed نويسنده Department of Pars Reservoir Engineering, Oil and Gas Engineering Management, Oil and Gas Company, Tehran, Iran Rafiee, Saeed , Hashemi، Abdolnabi نويسنده Department of Petroleum Engineering, Petroleum University of Technology, Ahwaz, Iran Hashemi, Abdolnabi , Shahi، Mohammad نويسنده Department of Petrophysics, National Iranian South Oil Company, Ahwaz, Iran Shahi, Mohammad
Abstract :
Petrophysical parameters such as porosity, water and oil saturations, formation resistivity factor, etc.
describe the storage capability of the porous media or the capacity of rocks to hold fluids. The
modified Archie’s equation . /
.
, also called the saturation equation, is used to
determine the water saturation. Archie’s parameters, namely , , and , are sometimes assumed
constant to simplify petrophysical measurements. But these parameters are not constant, particularly
in heterogeneous reservoirs. Inaccurate estimates of these parameters can cause significant errors in
the calculation of water saturation when using Archie’s equation and lead to discrepancies between
log interpretation and production test results. There are many factors affecting cementation factor ()
such as porosity, pore throat size, type of rock grains, type and distribution of clay content, degree of
cementation, and overburden pressure. In the present paper, the results of electrical resistivity
experiments are used to derive a new cementation factor correlation which can be applied to carbonate
parts of Asmari and Sarvak formations located in south-west Iran. In Iran, the cementation factor is
traditionally measured by Shell formula or is assumed equal to 2 to avoid difficulty. In the new
formula, increases with increasing porosity; however, in the Shell formula, decreases with
increasing porosity especially in the low porosity ranges, which is in disagreement with the current
paper results. In addition, the results demonstrate that it is not possible to introduce constant values
or separate cementation factor correlations versus porosity for different petrofacies and rock types.
Petrophysical evaluations are done to quantify hydrocarbon resources in formations under study.
Then, the water saturation is calculated with different calculation methods of cementation factor, .
The calculated water saturations are compared with the measured water saturations of preserved
cores.
